Scale Settings; Averaging - Keysight N9912A User Manual

Scale Settings

Adjust the Y-axis scale to see the relevant portions of the data trace. The Y-axis is
divided into 10 graticules.
This setting can be changed at any time without affecting calibration accuracy.
How to set Scale
 Press Scale / Amptd .
 Then choose from the following:
1.
2.
3. Set Scale, Reference Level, and Reference Position:
4. Set Top and Bottom graticule values. The scale per division is calculated.

Averaging

Trace Averaging helps to smooth a trace to reduce the effects of random noise on a
measurement. The FieldFox computes each data point based on the average of the
same data point over several consecutive sweeps.
Average Count determines the number of sweeps to average; the higher the average
count, the greater the amount of noise reduction.
An average counter is shown in the left edge of the screen as Avg N. This shows the
number of previous sweeps that have been averaged together to form the current
trace. When the counter reaches the specified count, then a 'running average' of the
last N sweeps is displayed. Average Count = 1 means there is NO averaging.
CAT (Cable and Antenna Test) Mode
After using the ▲|▼ arrows or the rotary knob, press Enter. The amount of
o
frequency increment is based on the current span and can NOT be changed in
CAT Mode.
Automatically adjusts the Y-axis to comfortably fit the Min and Max
Autoscale
amplitude of the trace on the screen.
Autoscales all of the traces on the screen, useful only for dual-
Autoscale All
trace configurations.
Manually enter a scale per division to view specific areas of the trace.
Scale
o
Manually set the value of the reference line. Enter a negative value by
Ref Level
o
pressing Run/Hold (+/-) either before or after typing a value.
Manually set the position of the reference line. Values must be
Ref Position
o
between 0 (TOP line) and 10 (BOTTOM line)
to set the value of the Top graticule.
Top
o
to set the value of the Bottom graticule.
Bottom
o
Enter a negative value by pressing Run/Hold (+/-) either before or after typing a
o
value.
Scale annotation on the FieldFox
screen
· Reference Line = red arrow
·Ref Level = -40 dB
· Ref Position = 1
· Scale = 2 dB per division
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